HP 8753E User Manual page 430

Pin assignments:
pin 1 is the data strobe
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pin 16 selects the printer
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pin 17 resets the printer
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pins 18-25 are ground
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Electrical specifications for 'ITL high:
volts(H) = 2.7 volts (V)
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current = 20 microamps @A)
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Electrical specifications for 'ITL low:
volts(L) = 0.4 volts (v)
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current = 0.2 milliamps (mA)
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Figure 6-81. Parallel Port Input and Output Bus Pin Locations in GPIO Mode
4 3 2 1 0
PARALLEL IN E[TS
I
0 1 2 3 4 5 5 6 6 7 7
PARALLEL OUT BITS
Application and Operation Concepts